Use -print-target-info instead of a hardcoded triple (swiftlang#2932)

(cherry picked from commit 9c8b37c)

rdar://problem/67948987

Author: neonichu

Sources/Build/XCFrameworkInfo.swift

@@ -9,6 +9,7 @@ See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 */
 
 import TSCBasic
+import TSCUtility
 import PackageModel
 import SPMBuildCore
 import Foundation

Sources/PackageLoading/ManifestLoader.swift

@@ -494,6 +494,7 @@ public final class ManifestLoader: ManifestLoaderProtocol {
         }
     }
 
+    private static var _hostTriple: Triple?
     private static var _packageDescriptionMinimumDeploymentTarget: String?
 
     /// Parse the manifest at the given path to JSON.
@@ -558,11 +559,15 @@ public final class ManifestLoader: ManifestLoaderProtocol {
 
             // Use the same minimum deployment target as the PackageDescription library (with a fallback of 10.15).
             #if os(macOS)
+            if Self._hostTriple == nil {
+                Self._hostTriple = Triple.getHostTriple(usingSwiftCompiler: resources.swiftCompiler)
+            }
+            let triple = Self._hostTriple!
             if Self._packageDescriptionMinimumDeploymentTarget == nil {
                 Self._packageDescriptionMinimumDeploymentTarget = (try MinimumDeploymentTarget.computeMinimumDeploymentTarget(of: macOSPackageDescriptionPath))?.versionString ?? "10.15"
             }
             let version = Self._packageDescriptionMinimumDeploymentTarget!
-            cmd += ["-target", "x86_64-apple-macosx\(version)"]
+            cmd += ["-target", "\(triple.tripleString(forPlatformVersion: version))"]
             #endif
 
             cmd += compilerFlags

Sources/SPMBuildCore/CMakeLists.txt

@@ -11,8 +11,7 @@ add_library(SPMBuildCore
   BuildSystem.swift
   BuiltTestProduct.swift
   Sanitizers.swift
-  Toolchain.swift
-  Triple.swift)
+  Toolchain.swift)
 # NOTE(compnerd) workaround for CMake not setting up include flags yet
 set_target_properties(SPMBuildCore PROPERTIES
   INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})

Tests/BuildTests/BuildPlanTests.swift

@@ -59,7 +59,7 @@ final class BuildPlanTests: XCTestCase {
         config: BuildConfiguration = .debug,
         flags: BuildFlags = BuildFlags(),
         shouldLinkStaticSwiftStdlib: Bool = false,
-        destinationTriple: Triple = hostTriple,
+        destinationTriple: TSCUtility.Triple = hostTriple,
         indexStoreMode: BuildParameters.IndexStoreMode = .off
     ) -> BuildParameters {
         return BuildParameters(
@@ -75,7 +75,7 @@ final class BuildPlanTests: XCTestCase {
     }
 
     func mockBuildParameters(environment: BuildEnvironment) -> BuildParameters {
-        let triple: Triple
+        let triple: TSCUtility.Triple
         switch environment.platform {
         case .macOS:
             triple = Triple.macOS
@@ -1765,7 +1765,7 @@ final class BuildPlanTests: XCTestCase {
         )
         XCTAssertNoDiagnostics(diagnostics)
 
-        func createResult(for dest: Triple) throws -> BuildPlanResult {
+        func createResult(for dest: TSCUtility.Triple) throws -> BuildPlanResult {
             return BuildPlanResult(plan: try BuildPlan(
                 buildParameters: mockBuildParameters(destinationTriple: dest),
                 graph: graph, diagnostics: diagnostics,
@@ -2207,7 +2207,8 @@ final class BuildPlanTests: XCTestCase {
         ])
     }
 
-    func testBinaryTargets(platform: String, arch: String, destinationTriple: Triple) throws {
+    func testBinaryTargets(platform: String, arch: String, destinationTriple: TSCUtility.Triple)
+    throws {
         let fs = InMemoryFileSystem(emptyFiles:
             "/Pkg/Sources/exe/main.swift",
             "/Pkg/Sources/Library/Library.swift",
@@ -2345,9 +2346,9 @@ final class BuildPlanTests: XCTestCase {
 
     func testBinaryTargets() throws {
         try testBinaryTargets(platform: "macos", arch: "x86_64", destinationTriple: .macOS)
-        let arm64Triple = try Triple("arm64-apple-macosx")
+        let arm64Triple = try TSCUtility.Triple("arm64-apple-macosx")
         try testBinaryTargets(platform: "macos", arch: "arm64", destinationTriple: arm64Triple)
-        let arm64eTriple = try Triple("arm64e-apple-macosx")
+        let arm64eTriple = try TSCUtility.Triple("arm64e-apple-macosx")
         try testBinaryTargets(platform: "macos", arch: "arm64e", destinationTriple: arm64eTriple)
     }
 
@@ -2481,7 +2482,7 @@ fileprivate extension TargetBuildDescription {
     }
 }
 
-fileprivate extension Triple {
+fileprivate extension TSCUtility.Triple {
     static let x86_64Linux = try! Triple("x86_64-unknown-linux-gnu")
     static let arm64Linux = try! Triple("aarch64-unknown-linux-gnu")
     static let arm64Android = try! Triple("aarch64-unknown-linux-android")

swift-tools-support-core/Sources/TSCUtility/CMakeLists.txt

@@ -29,6 +29,7 @@ add_library(TSCUtility
   SimplePersistence.swift
   StringExtensions.swift
   StringMangling.swift
+  Triple.swift
   URL.swift
   Verbosity.swift
   Version.swift